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193 lines
7.5 KiB
Markdown
193 lines
7.5 KiB
Markdown
6 years ago
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# randomatic [](https://www.npmjs.com/package/randomatic) [](https://npmjs.org/package/randomatic) [](https://npmjs.org/package/randomatic) [](https://travis-ci.org/jonschlinkert/randomatic)
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> Generate randomized strings of a specified length using simple character sequences. The original generate-password.
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Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support.
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## Install
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Install with [npm](https://www.npmjs.com/):
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```sh
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$ npm install --save randomatic
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```
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## Usage
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```js
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var randomize = require('randomatic');
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```
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## API
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```js
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randomize(pattern, length, options);
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randomize.isCrypto;
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```
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* `pattern` **{String}**: (required) The pattern to use for randomizing
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* `length` **{Number}**: (optional) The length of the string to generate
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* `options` **{Object}**: (optional) See available [options](#options)
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* `randomize.isCrypto` will be `true` when a cryptographically secure function is being used to generate random numbers. The value will be `false` when the function in use is `Math.random`.
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### pattern
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> The pattern to use for randomizing
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Patterns can contain any combination of the below characters, specified in any order.
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**Example:**
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To generate a 10-character randomized string using all available characters:
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```js
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randomize('*', 10);
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//=> 'x2_^-5_T[$'
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randomize('Aa0!', 10);
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//=> 'LV3u~BSGhw'
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```
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* `a`: Lowercase alpha characters (`abcdefghijklmnopqrstuvwxyz'`)
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* `A`: Uppercase alpha characters (`ABCDEFGHIJKLMNOPQRSTUVWXYZ'`)
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* `0`: Numeric characters (`0123456789'`)
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* `!`: Special characters (`~!@#$%^&()_+-={}[];\',.`)
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* `*`: All characters (all of the above combined)
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* `?`: Custom characters (pass a string of custom characters to the options)
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### length
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> The length of the string to generate
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**Examples:**
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* `randomize('A', 5)` will generate a 5-character, uppercase, alphabetical, randomized string, e.g. `KDJWJ`.
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* `randomize('0', 2)` will generate a 2-digit random number
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* `randomize('0', 3)` will generate a 3-digit random number
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* `randomize('0', 12)` will generate a 12-digit random number
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* `randomize('A0', 16)` will generate a 16-character, alpha-numeric randomized string
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If `length` is left undefined, the length of the pattern in the first parameter will be used. For example:
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* `randomize('00')` will generate a 2-digit random number
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* `randomize('000')` will generate a 3-digit random number
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* `randomize('0000')` will generate a 4-digit random number...
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* `randomize('AAAAA')` will generate a 5-character, uppercase alphabetical random string...
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These are just examples, [see the tests](./test.js) for more use cases and examples.
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## options
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> These are options that can be passed as the third argument.
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#### chars
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Type: `String`
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Default: `undefined`
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Define a custom string to be randomized.
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**Example:**
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* `randomize('?', 20, {chars: 'jonschlinkert'})` will generate a 20-character randomized string from the letters contained in `jonschlinkert`.
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* `randomize('?', {chars: 'jonschlinkert'})` will generate a 13-character randomized string from the letters contained in `jonschlinkert`.
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#### exclude
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Type: `String|Array`
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Default: `undefined`
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Specify a string or array of characters can are excluded from the possible characters used to generate the randomized string.
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**Example:**
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* `randomize('*', 20, { exclude: '0oOiIlL1' })` will generate a 20-character randomized string using all of possible characters except for `0oOiIlL1`.
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## Usage Examples
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* `randomize('A', 4)` (_whitespace insenstive_) would result in randomized 4-digit uppercase letters, like, `ZAKH`, `UJSL`... etc.
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* `randomize('AAAA')` is equivelant to `randomize('A', 4)`
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* `randomize('AAA0')` and `randomize('AA00')` and `randomize('A0A0')` are equivelant to `randomize('A0', 4)`
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* `randomize('aa')`: results in double-digit, randomized, lower-case letters (`abcdefghijklmnopqrstuvwxyz`)
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* `randomize('AAA')`: results in triple-digit, randomized, upper-case letters (`ABCDEFGHIJKLMNOPQRSTUVWXYZ`)
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* `randomize('0', 6)`: results in six-digit, randomized numbers (`0123456789`)
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* `randomize('!', 5)`: results in single-digit randomized, _valid_ non-letter characters (`~!@#$%^&()_+-={}[]
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* `randomize('A!a0', 9)`: results in nine-digit, randomized characters (any of the above)
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_The order in which the characters are defined is insignificant._
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## About
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<details>
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<summary><strong>Contributing</strong></summary>
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Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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</details>
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<details>
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<summary><strong>Running Tests</strong></summary>
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Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:
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```sh
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$ npm install && npm test
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```
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</details>
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<details>
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<summary><strong>Building docs</strong></summary>
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_(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_
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To generate the readme, run the following command:
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```sh
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$ npm install -g verbose/verb#dev verb-generate-readme && verb
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```
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</details>
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### Related projects
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You might also be interested in these projects:
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* [pad-left](https://www.npmjs.com/package/pad-left): Left pad a string with zeros or a specified string. Fastest implementation. | [homepage](https://github.com/jonschlinkert/pad-left "Left pad a string with zeros or a specified string. Fastest implementation.")
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* [pad-right](https://www.npmjs.com/package/pad-right): Right pad a string with zeros or a specified string. Fastest implementation. | [homepage](https://github.com/jonschlinkert/pad-right "Right pad a string with zeros or a specified string. Fastest implementation.")
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* [repeat-string](https://www.npmjs.com/package/repeat-string): Repeat the given string n times. Fastest implementation for repeating a string. | [homepage](https://github.com/jonschlinkert/repeat-string "Repeat the given string n times. Fastest implementation for repeating a string.")
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### Contributors
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| **Commits** | **Contributor** |
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| --- | --- |
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| 56 | [jonschlinkert](https://github.com/jonschlinkert) |
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| 6 | [doowb](https://github.com/doowb) |
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| 4 | [kivlor](https://github.com/kivlor) |
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| 2 | [realityking](https://github.com/realityking) |
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| 2 | [ywpark1](https://github.com/ywpark1) |
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| 1 | [TrySound](https://github.com/TrySound) |
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| 1 | [drag0s](https://github.com/drag0s) |
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| 1 | [paulmillr](https://github.com/paulmillr) |
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| 1 | [sunknudsen](https://github.com/sunknudsen) |
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| 1 | [faizulhaque-tp](https://github.com/faizulhaque-tp) |
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| 1 | [michaelrhodes](https://github.com/michaelrhodes) |
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### Author
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**Jon Schlinkert**
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* [GitHub Profile](https://github.com/jonschlinkert)
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* [Twitter Profile](https://twitter.com/jonschlinkert)
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* [LinkedIn Profile](https://linkedin.com/in/jonschlinkert)
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### License
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Copyright © 2018, [Jon Schlinkert](https://github.com/jonschlinkert).
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Released under the [MIT License](LICENSE).
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***
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_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.8.0, on October 23, 2018._
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